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The Colorado shooting suspect planned the rampage that killed 12 midnight-movie patrons with “
calculation and deliberation,” police said today.

James Holmes received deliveries for months that authorities believe armed him for battle and
were used to rig his apartment with dozens of bombs.

Authorities today cleared all the dangerous explosive materials from inside Holmes’ apartment
in Aurora, a suburb of Denver.

Holmes is accused of opening fire and setting off gas canisters in an Aurora theater minutes
into the premiere of the Batman film
The Dark Knight Rises early Friday. The attack left 12 dead and 58 injured.

The White House announced today that President Barack Obama will visit Aurora on Sunday to
attend a memorial service for the victims.

In another development, it was learned that Holmes had been one of six neuroscience students
at the University of Colorado-Denver to get National Institutes of Health grant money for his
studies.

The institute says the university decides who gets the grants, and it wasn’t known how much
money he received.

That probably would have been one of his officers, Oates said today. “You think we’re angry?
We sure as hell are angry.”

Tonight, police said that with all hazards removed from the apartment, residents evacuated
from surrounding buildings could return home. The exception was Holmes’ building, where authorities
still were collecting evidence.

Authorities wouldn’t discuss a motive for one of the deadliest mass shootings in recent U.S.
history.

Oates said Holmes received deliveries by mail to his home and school for four months, and he
bought thousands rounds of ammunition on the Internet.

“We think this explains how he got his hands on the magazine, ammunition,” Oates said, and
the rigged explosives in his apartment.

Federal authorities detonated one small explosive and disarmed others inside Holmes’
apartment after sending in a robot to take down a trip wire, FBI Special agent James Yacone said.

Bomb technicians then neutralized what Yacone called a “hyperbolic mixture” and an improvised
explosive device containing an unknown substance. There also were containers of accelerants, he
said. “It was an extremely dangerous environment,” Yacone said.

Holmes, 24, who is from suburban San Diego, was in solitary confinement for his protection in
a county detention facility today, held without bond on suspicion of multiple counts of
first-degree murder. He is scheduled to have an initial hearing on Monday and has been appointed a
public defender, authorities said.

Apart from a speeding ticket, Holmes had no previous encounters with the police in Colorado.

Of the 58 people wounded in the shooting, hospital officials said some patients had suffered
serious head and chest injuries.

The University of Colorado Hospital, which treated 23 victims of the shooting, said 10 of
those people had been released and five remained in critical condition.

The Medical Center of Aurora said that of its seven patients, four remained in the
intensive-care unit, and three were on the main trauma floor.

It wasn’t known why the gunman chose a movie theater as the site of the assault, or whether
he intended some twisted, symbolic link to the film’s violent scenes.

Holmes, who authorities said had dyed his hair red and called himself “the Joker” in a
reference to Batman’s comic-book nemesis, might have blended in with other moviegoers who wore
costumes as heroes and villains. Some witnesses said they thought at first that his appearance in
the moviehouse was a theatrical enhancement to the film.

He was armed with an AR-15 assault rifle, a 12-gauge shotgun and a Glock .40-caliber handgun,
Oates said. Police found an additional Glock .40-caliber handgun in his car, parked just outside
the theater’s rear emergency exit, he said. He also had bought an urban assault vest.

Holmes had bought the guns legally at three area gun stores in the past 60 days and bought
6,000 rounds of ammunition online, including a 100-round drum magazine for an assault rifle, Oates
said.

Holmes struggled through his first academic year at the Colorado-Denver, and he had dropped
out by this spring.

Neighbors in his gang-ridden neighborhood in Aurora described him as a solitary figure,
always alone as he bought beer and liquor at neighborhood shops, ate burritos or rode his bicycle
through the streets.

He appears to have created an online personal ad on the website Adult Friend Finder, posting
a photo of himself with bright orange hair and saying that he was “looking for a fling.” He
described himself as a nice guy, or as nice as any man “who does these sorts of shenanigans.” The
authenticity of the profile could not be independently verified.

Some nights, neighbors heard loud music throbbing in his third-floor apartment, and they
often complained about it. Sometimes, the windows were masked by newspaper, as if he wanted no one
to see inside.

After buying a ticket to the movie, Holmes went into the theater and propped open an exit
door several minutes into the film, a federal law-enforcement official said. The suspect then
returned in protective gear and opened fire with high-powered guns, officials said.

Before dropping out of graduate school, Holmes took a class that explored the biological
origins of psychiatric and neurological disorders. He was scheduled to give a presentation on “
MicroRNA Biomarkers,” according to a class schedule published online. The topic appears to
demonstrate an interest in the genetic basis of mental illness.

The field of micro-RNA research is relatively new, and scientists know little about how the
short snippets of genetic material that can turn off or potentially turn up the action of a gene
might play a role in illnesses such as bipolar disorder or schizophrenia, said Dr. Thomas Lehner,
director of the Office of Genomics Research Coordination at the National Institute of Mental Health
in Bethesda, Md.

But in recent years, Lehner said, researchers have been searching for differences in micro
RNA that might predispose certain people to severe mental illness.

While many questions remain unanswered, shaken law-enforcement officials in Aurora urged
residents to face life.

“I just don’t want the shameless and senseless act of one man to make this difficult for
families to move on,” Aurora Fire Chief Mike Garcia said. “Go out. See a movie. Go out into your
city. Don’t be afraid.”

Information from Reuters and The New York Times
was included in this story.